That estimate came from Chris Lafakis, an economist at Moody’s Economy.com. And while it’s less than 1 percent of the city’s annual tourism budget, it’s still a sizable addition.

“There’s absolutely going to be more people coming from out of town,” he said in a telephone interview. “But given the size of Miami’s economy, it’s not going to be a noticeable boost.”

The arrival of James and Chris Bosh to the nucleus of the franchise has spurred a rebiurth across the bay in the downtown area outside AmericanAirlines Arena.

“We’re well aware that the eyes of the world will be on Miami, and we wanted to put our best foot forward,” Marc Sarnoff, chairman of the Miami Downtown Development Authority and a city commissioner, told Bloomberg. Heat owner “Mickey Arison probably gave us a better stimulus package than 10 Barack Obamas combined.”

The new additions are also prompting a concerted effort by the Heat to get their fans into the Arena earlier. Miami fans traditionally have had the reputation as one of the latest-arriving groups in the league.

In a way to break up that trend, the Heat are starting a program called “Fan Up, Miami!,” urging ticket holders to show up before tip-off by giving early arrivers discount cards for concessions and merchandise.

“Most people don’t show up until the middle of the first quarter,” Julio Rojas Sarmiento, a 23-year-old fan who grew up in Miami, told Bloomberg in an e-mail. “It won’t be a problem anymore, though.”

If James and Bosh won’t take care of it, a few cheap boxes of popcorn or discounted drinks should do the trick.